Limestone quarry did not affecred the
intensity of photosynthesis in the species
analyzed, compared to the same species, from an
reprezentativ area, except the specie Trifolium
sp., in which d = 2.90> 2.57, p = 0.01, that caused
the rejection of the null hypothesis. At the other
species (Taraxacum sp.: D = 1.52 <1.96, p =
0.05), (Plantago sp.: D = 0.73 <1.96, p = 0.05),
(Fragaria sp .: d = 1.46 <1.96, p = 0.05), the null
hypothesis can be accepted, the differences
between mediums not being significant (in case
1). At the two working mode, the differences
between average, in all cases, were significant,
with probability levels of 0.001 and 0.01. 22
The only explanation of these differences
consisted in calcareous dust deposits on the
leaves of species in the quarry area, which
explains the rejection of the null hypothesis (in
case 2). And also at assimilating pigments null
hypothesis is accepted,the difference between
average not being significant in both casis of
work, case 1 and case 2: Trifolium sp.: D = 0.38
<1.96; p = 0.05; Taraxacum sp.: d = 0.58 <1.96; p
= 0.05; Plantago sp.: d = 0.98 <1.96; p = 0.05;
Fragaria sp.: d = 0.46 < 1.96;p=0.05. | 
